DIN ISO 21940-12 Beiblatt 1:2015-04

This document supplements DIN ISO 21940-12 by a comprehensive description of the Procedure G 'Balancing at multiple rotational speeds' which is the only universal and always applicable balancing procedure. The document gives a broad and systematic explanation of the unbalances and describes the balancing at multiple rotational speeds using the modal approach. It summarizes the experience with the Procedure G and gives a practical recommendation for the design of the balancing process of rotors with flexible behaviour.